Chloroplast Structure
Inter-
membrane Granum
Outer
Space
Membrane
Lamellae
Inner
Membrane
Starch
Grain
Ribosome
Stroma
Thylakoid DNA
Space Lipid Globule
Thylakoid
Membrane
Photosynthetic Pigments
There are light-harvesting funnels in the thylakoid membrane from the stroma to the
thylakoid space
Pigments at the end of these funnels are arranged in light-harvesting clusters called
photosystems
Many accessory pigments surround a primary pigment – accessory pigments pass
energy form absorbed light onto the primary pigments (which act as reaction centres)
Primary pigments can only absorb certain wavelengths of light so accessory pigments
help harvest energy from other wavelengths
Photosystem I – chlorophyll a P700
Photosystem II – chlorophyll a P680
Blue and red are most absorbed, and green is least absorbed (most reflected) giving a
green colour
Inter-
membrane Granum
Outer
Space
Membrane
Lamellae
Inner
Membrane
Starch
Grain
Ribosome
Stroma
Thylakoid DNA
Space Lipid Globule
Thylakoid
Membrane
Photosynthetic Pigments
There are light-harvesting funnels in the thylakoid membrane from the stroma to the
thylakoid space
Pigments at the end of these funnels are arranged in light-harvesting clusters called
photosystems
Many accessory pigments surround a primary pigment – accessory pigments pass
energy form absorbed light onto the primary pigments (which act as reaction centres)
Primary pigments can only absorb certain wavelengths of light so accessory pigments
help harvest energy from other wavelengths
Photosystem I – chlorophyll a P700
Photosystem II – chlorophyll a P680
Blue and red are most absorbed, and green is least absorbed (most reflected) giving a
green colour
